机械钻速与金刚石底出刃、钻进规程参数关系的试验研究

Experimental research on dependence of penetration rate on diamond exposure at bit face and drilling parameters

摘要:

俄罗斯钻探专家提出在金刚石正常钻进条件下，破碎岩屑的数量应与孔底排出岩屑的数量相应，否则，岩屑将会充满孔底部分，形成“岩屑垫”，阻碍岩石破碎，所以设计钻头和选择钻进规程参数时，应该保证破碎岩屑体积与孔底表面、钻头胎体间的体积，即充满孔底的体积相等。在此基础上提出了机械钻速（钻头每转进尺）的计算公式。该公式给出了机械钻速与金刚石底出刃、岩屑排出程度的关系。提出了金刚石正常出刃和非正常出刃的概念，并对正常出刃金刚石钻头和非正常出刃金刚石钻头进行了实验室试验研究和野外生产试验研究，取得了肯定的结果。

Abstract:

Russian drilling specialists have proposed such an idea that in normal diamond drilling the quantity of produced cuttings should be correspond to the quantity of cuttings discharged by the drilling fluid, otherwise the cuttings will fill the bottom of the hole, forming “cuttings cushion” and obstructing rock fragmentation. Therefore, in designing the drill bit and defining the drilling parameters, equality between the volume of produced cutting and that between the face of the bottom hole and drill bit matrix (i.e. the filled volume of the hole bottom) should be guaranteed. On this basis, the calculation formula for defining the penetration rate (footage per revolution) is presented. The formula shows the function of the penetration rate vs diamond exposure at drill bit face and degree of discharged cuttings. The concepts of normal and anomalous diamond exposure have been given. Laboratory and field production experiments have been performed on the diamond drill bits with normal and anomalous diamond exposure with positive results.